Having had my SONY VTX-750U digibox for about 4 years, it decided to develop what my local sat shop called "bird tweet". Thats a chirping sound about every 15 seconds on all channels. They told me it had been a common problem with some of the earlier models and that an internal chip on the PCB would have to be replaced but.............. SONY have never released spares for repairers to fix these boxes so you have to either get the sat shop to call them or go direct to SONY. Its cost me £94 inc VAT & carrage for a refurb unit as they don't make them anymore. The lady on the phone allowed me to ask for a 760 as opposed to my 750 (hope this cures the poor RF shielding on the 750). This also matches the Digibox to my light silver TV and DVD. The 750 being a darker silver. If anybody is interested here is the direct phone number: 08705 168648.